PITTSBURGH (AP)  A human heart was kept beating on
its own outside a body Saturday during a test of a new medical device intended
to aid in organ transplants.

Doctors at the University of Pittsburgh Medical Center
used the heart from an 80-year-old man to show how the Portable Organ Preservation
System works. The machine had already been tested using a human kidney and animal
organs.

"What we have in our hands today is a technology which
allows the organ to be removed from the body and allows it to function," said
Robert Kormos, director of the center's thoracic transplantation and artificial
heart program.

Doctors say the technology could give surgeons more time
to get potential recipients to a hospital where an organ can be transplanted,
and more time to test for organ matches.

Organs are chilled after being removed from the donor,
a process in which deterioration begins immediately. A heart can last about
six hours after being removed.

The machine, which was developed by TransMedics Inc. of
Woburn, Mass., pushes warm blood into the organ, keeping it functioning.

The heart used in Saturday's demonstration was deemed unsuitable
for transplant. Doctors would not release any information about the donor or
how he died. They planned to keep the heart connected to the machine for 24
hours.

The first human organ to be connected to the machine was
a kidney, which was kept functioning for almost 24 hours in a test this summer
at the University of Chicago.

Waleed Hassanein, president and chief executive of TransMedics,
said the company will submit its trials to the U.S. Food and Drug Administration
in the fall and hopes to market its machine by the end of next year.

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